B1036

Circuit Description
When you first turn the ignition switch to the RUN position, the Inflatable Restraint Sensing and Diagnostic Module (SDM) performs tests to diagnose critical malfunctions within the SDM. Next the SDM measures the following circuits to ensure they are within their respective normal voltage ranges:
^ Ignition Positive Voltage.
^ 23 VLR.
^ Deployment loop voltages.

Then the SDM proceeds to CONTINUOUS MONITORING. The SDM contains a resistor network connected to 5 volts, ground, and to the SDM front-end sensor signal terminal 9. The SDM monitors two front end discriminating sensors that are wired in parallel. The 1.0 K ohm resistor in the RH Inflatable Restraint front end discriminating sensor parallel to the normally open switches in both sensors and provides a parallel path to ground. This causes a specified percentage of voltage to appear at the SDM front-end sensor signal input. The SDM monitors this voltage to detect shorts to power or an open discriminating sensor.

Conditions for Setting the DTC
^ The SDM is configured for an Inflatable Restraint front end discriminating sensor.
^ The voltage at front-end sensor signal terminal 9 is more than 5.0 volts for 500 milliseconds.

The CONTINUOUS MONITORING test checks for this DTC. This test occurs when Ignition Positive Voltage is within the normal operating voltage range.

Action Taken When the DTC Sets
^ The SDM sets a diagnostic trouble code.
^ The SDM turns ON the AIR BAG warning lamp.

Conditions for Clearing the DTC
^ Current DTC-The voltage at front-end sensor signal terminal 9 is less than 3.2 volts for 500 milliseconds.
^ History DTC
- You issue a scan tool CLEAR CODES command.
- After 250 malfunction free ignition cycles have occurred

Diagnostic Aids
A broken or chafed wire in the Inflatable Restraint front end discriminating sensor circuit may cause an intermittent condition. Inspect circuit 2160 and circuit 1851 carefully for cutting or chafing.

When measurements are requested in this table, use the J 39200 Digital Multimeter with the correct terminal adapter from the J 35616-A Connector Test Adapter Kit. When an inspection for proper connection is requested, refer to Intermittents and Poor Connections. When a wire, connector or terminal repair is requested, use the J 38125-B Terminal Repair Kit. Refer to Wiring Repair.

Test Description
The numbers below refer to the step numbers on the diagnostic table:
2. This test checks for proper contact or corrosion of the yellow 2-way connector.
7. This test checks for a malfunctioning discriminating sensor.
8. This test checks for an open in circuit 1851.
11. This test isolates the open in circuit 1851 to one side of C101.
14. This test checks for proper contact or corrosion of the Inflatable Restraint Sensing and Diagnostic Module (SDM) connector.
19. This test checks for an open in CKT2160.
22. This test isolates the open in circuit 2160 to one side of C101.
25. This test checks for a short to voltage in circuit 2160.